Photosensitized degradation of 2,4′,5-trichlorobiphenyl (PCB 31) by dissolved organic matter

被引:42
作者
Chen, Lei [1 ,2 ]
Tang, Xianjin [1 ]
Shen, Chaofeng [1 ,3 ]
Chen, Chen [1 ]
Chen, Yingxu [1 ,2 ,3 ]
机构
[1] Zhejiang Univ, Coll Environm & Resource Sci, Hangzhou 310029, Zhejiang, Peoples R China
[2] Key Lab Water Pollut Control & Environm Safety, Hangzhou 310029, Zhejiang, Peoples R China
[3] Zhejiang Univ, Key Lab Nonpoint Source Pollut Control, Minist Agr, Hangzhou 310029, Zhejiang, Peoples R China
基金
中国国家自然科学基金; 国家高技术研究发展计划(863计划);
关键词
Polychlorinated biphenyls (PCBs); Phototransformation; Dissolved organic matter (DOM); Reactive substances; Intra-DOM; SINGLET OXYGEN; HUMIC SUBSTANCES; PHOTOCHEMICAL FORMATION; FURFURYL ALCOHOL; MOLECULAR-WEIGHT; SURFACE WATERS; AROCLOR; 1254; PHOTOLYSIS; 2,4,6-TRIMETHYLPHENOL; PHOTODEGRADATION;
D O I
10.1016/j.jhazmat.2011.10.061
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The presence of dissolved organic matter (DOM) in aquatic system has an important influence on the phototransformation of organic contaminants through the production of reactive substances, such as hydroxyl radicals ((OH)-O-center dot), singlet oxygen (O-1(2)), and DOM triplet states ((DOM)-D-3*) under solar irradiation. Addition of 5 mg/L of Humic acid sodium (HA), Suwannee River NOM (SRNOM) and Nordic Reservoir NOM (NRNOM) all accelerated the photodegradation of 2,4',5-trichlorobiphenyl (PCB 31) significantly, with a pseudo-first-order rate constant of 0.0933, 0.0651 and 0.0486 in the initial 12 h, respectively. HA and SRNOM, the allochthonous DOM, showed higher reactivity in the photolysis of PCB 31. The maximum photodegradation rate was observed in 5 mg/L of DOM solution. The roles of the reactive substances were studied by the inhibitory experiments, which suggested that (OH)-O-center dot and intra-DOM O-1(2) were more important for the photolysis of PCB 31 than other reactive substances, accounting for 35.1% and 47.1% of the degradation, respectively. The main degradation products of PCB 31 detected by GC-MS were 4-chlorobenzoic acid, 2,5-dichlorobenzoic acid, hydroxy-2,5-dichloroben:zoic acid, 4-hydroxy-2',5'-dichlorobiphenyls and hydroxy-trichlorobiphenyls. The degradation pathways were accordingly proposed. Photosensitized degradation by DOM, especially the intra-DOM reactions, may be a very important mechanism for the transformation of PCBs and other hydrophobic organic contaminants in the environment. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:1 / 6
页数:6
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